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Old 07-31-2012, 03:01 PM   #11
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One other thing, but it's expensive.

Colt now offers the LE901 in .308 (7.62X51)

This lower will accept a Colt 5.56X45 AR-15 upper, so you can have both uppers on one lower.

It's a solution to the problem, but it is mighty expensive, and AFAIK, it's only available as complete units, bot parts.

(I might be mistaken on that one, but that is my understanding)

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Old 07-31-2012, 07:20 PM   #12
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Quote:
Originally Posted by locutus
One other thing, but it's expensive.

Colt now offers the LE901 in .308 (7.62X51)

This lower will accept a Colt 5.56X45 AR-15 upper, so you can have both uppers on one lower.

It's a solution to the problem, but it is mighty expensive, and AFAIK, it's only available as complete units, bot parts.

(I might be mistaken on that one, but that is my understanding)
So if the lower will accept a 5.56 upper, wouldn't it accept all 5.56 uppers?
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Old 07-31-2012, 08:02 PM   #13
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Specs

Special Features

1-Piece Upper Receiver with Back Up Iron Sights (BUIS)
Full Floated Barrel
Bayonet Lug and Flash Hider
Ambidextrous Controls
Accepts Mil-Spec 5.56 Colt Uppers

I would say it accepts the normal mil spec AR upper of most any brand .

This pic explains more how it works than any I have found , it uses the adapter to make the smaller upper work which also makes use for your smaller 5.56 mags

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Old 07-31-2012, 08:04 PM   #14
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Quote:
Originally Posted by X-mark View Post
not only do ar15 parts and ar10 parts not go together...there are two non-compatible ar10 formats as well (DPMS and Armalite). Your best bet is to buy a complete rifle or really think about what components you want and stick to either the DPMS format or the Armalite format.
Very true though I wouldn't refer to the "DPMS" standard, it's the original ArmaLite AR-10, Stoner or Knight's Armament SR-25 format. Magpul of course makes PMAGs for this format. DPMS came to the party much later. RRA uses a third format that uses FAL mags.

But things may be improving, as of early this year ArmaLite has returned to the original AR-10 magazine/upper format with their AR-10A. (Their AR-10B of course uses the M14 style mags.) I think we're beginning to see a standard forming around the SR-25/AR-10A and of course our military has a contract with KAC.
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